I'd like to begin with a quote from Ivanka Majic here:
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/628087/comments/31
"The installation experience should be attractive and effortless to reassure new users that Ubuntu is the right choice. The process should feel safe and should only highlight risk when necessary (e.g. when data will be destroyed)."
Unfortunately the 10.10 installer has resulted in the loss of existing operating systems and data:
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/655950